<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 头部警告区域 -->
        <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                v-model="selectedCateKeys"
                :options="catelist"
                expand-trigger="hover"
                :props="cateProps"
                @change="handleChange"
                clearable></el-cascader>
            </el-col>
        </el-row>

        <!-- tabs页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">

            <!-- 添加动态参数面板 -->
            <el-tab-pane label="动态参数" name="many">
                <!-- 添加参数按钮 -->
                <el-button type="primary" @click="addDialogVisible = true" size="mini" :disabled="isBtnDisabled">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开列 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"></el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" lable="#"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" size="mini">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" size="mini">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>

            <!-- 添加静态属性面板 -->
            <el-tab-pane label="静态属性" name="only">
                <!-- 添加属性按钮 -->
                <el-button type="primary" @click="addDialogVisible = true" size="mini" :disabled="isBtnDisabled">添加属性</el-button>

                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开列 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"></el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" lable="#"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" size="mini">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
    :title="'添加'+titleText"
    :visible.sync="addDialogVisible"
    width="50%"
    @close="addDialogClosed">
    <!-- 添加参数表单 -->
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
    </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
        <!-- 添加参数对话框 -->
    <el-dialog
    :title="'修改'+titleText"
    :visible.sync="editDialogVisible"
    width="50%"
    @close="editDialogClosed">
    <!-- 添加参数表单 -->
    <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
    </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
    </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页面名称
            activeName: 'many',
            // 动态参数数据
            manyTableData: [],
            // 静态参数数据
            onlyTableData: [],
            // 控制添加对话框显示隐藏
            addDialogVisible: false,
            // 添加参数表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name: [
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },
            // 修改表单对话框显示隐藏
            editDialogVisible: false,
            // 修改表单数据
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name: [
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有的商品参数列表
        async getCateList(){
            const { data: res } = await this.$http.get('categories')
            if(res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
            this.catelist = res.data
        },
        // 级联选择框选中项变化触发此函数
        handleChange(){
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
        },
        // 获取参数列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if (this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }

            // 证明选中的是三级分类
            // 根据所选分类id行当前所处面板获取对应参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel: this.activeName}})
            if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
            if(this.activeName === 'many'){
                res.data.forEach(item=>{
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                    // 控制文本框的显示与隐藏
                    item.inputVisible = false
                    // 文本框中输入的值
                    item.inputValue = ''
                })
                this.manyTableData = res.data
            }else{
                res.data.forEach(item=>{
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                    // 控制文本框的显示与隐藏
                    item.inputVisible = false
                    // 文本框中输入的值
                    item.inputValue = ''
                })
                this.onlyTableData = res.data
            }
        },
        // 监听添加对话框关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return
                const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name: this.addForm.attr_name, attr_sel: this.activeName})
                if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
                this.$message.success('添加参数成功！')
                this.getParamsData()
                this.addDialogVisible = false;
            })
            
        },
        // 点击按钮展示修改对话框
        async showEditDialog(id){
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${id}`,{params:{attr_sel: this.activeName}})
            if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 修改对话框关闭重置事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改数据信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name: this.editForm.attr_name, attr_sel: this.activeName})
                if(res.meta.status !== 200) return this.$message.error('修改参数失败！')
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false;
            })
        },
        // 根据id删除对应参数项
        async removeParams(id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err=>err)
            if(confirmResult !== 'confirm') return this.$message.info('已取消删除！')
            const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
            if(res.meta.status !== 200) return this.$message.error('删除参数失败！')
            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 文本框失去焦点，或摁下了enter都会触发
        handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return， 则证明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存这次操作
            this.saveAttrValue(row)
        },
        // 将对attr_vals操作保存到数据库
        async saveAttrValue(row){
            // 需要发起请求，保存这次操作
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ')})
            if (res.meta.status !== 200) return this.$message.error('修改参数项失败！')
            this.$message.success('修改参数项成功！')
            // this.getParamsData()  
        },
        // 点击按钮展示文本输入框
        showInput(row){
            row.inputVisible = true
            // 让文本框自动获得焦点
            this.$nextTick(()=>{
                this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        // 删除对应的参数和选项
        handleClose(i, row){
            row.attr_vals.splice(i, 1)
            this.saveAttrValue(row)
        }
    },
    computed:{
        // 控制添加参数属性禁用状态
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3) return true
            return false
        },
        // 当前选中的三级分类id
        cateId(){
            if(this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many') return '动态参数'
            return '静态属性'
        }
    }
}
</script>

<style scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 0 10px;
    }
    .input-new-tag{
        width: 120px;
    }
</style>